Trolley-wheel.



PATENTED APR. 21.1903. F. P. GROG-KBTT,& O. P. JOHNS-0N.

TROLLEY WHEEL. APPLICATION FILED JAN. 23, 1899.

17-0 MODEL.

t Witnesses:

UNITED STATES 5 PATENT OF ICE.

FRED P. OROCKETT AND OSRO PRENTISS JOHNSON, OF KALAMAZOO, MICHIGAN, ASSIGNORS TO THE STAR BRASS WORKS, OF KALA- MAZOO, MICHIGAN.

TROLLEY-WHEEL.

SPECIFICATION forming part of Letters Patentlq'o. 725,938, dated April 21, 1903. Application filed January 23, 1890. Serial-No. 703,200. (No model.)

To all whom it may concern.-

Be it known that we, FRED P. CROOKETT and O'sno PRENTISS JOHNSON, citizens of the United States, residing at the city of Kalamazoo, in the county of Kalamazoo and State of Michigan, have invented certain new and useful Improvements in Trolley-Wheels, of which the following is a specification.

This invention relates to improvements in trolley-wheels and means of lubricating the same.

Heretofore it has been attempted to lubricate a trolley-wheelby some means, as deliv-' as they will be worn out much in advance of This invention' other parts of the wheel. makes use of both of these devices effectively applied, it having been discovered that a very small quantity of oil in connection with the bushings containing the packages of graphite is very efi ectiveand that by this method the bushing will be perfectly lubricated and will last as'long as the trolley-wheel itself.

The objects of this invention are therefore to provide means whereby a graphite-bushing is utilized in connection-with a receptacle for oil which shall deliver a small quantity of oil to the bushing to successfully lubricate the same.

Minor objects of the structure will appear' in the detailed description to follow.

We accomplish these objects of our inven waste of oil.

In the drawings similar letters of reference refer to similar parts throughout both views.

A represents the trolley-wheel, which is provided with a suitable hub, which is enlarged at A and made hollow, so that a receptacle A is formed therein, which preferably is annular and extends entirely around the hu b. An opening is.provided for the introduction ofoil, which is closed by the screwplug 0, and bushing B is driven tightly into the hub and completes the-formation of the receptacle A. Through one side of the bushing, near its center, a small perforation e is made to allow the escape of oil from the receptacle into the bearings. The bushing is made up of steel-or other suitable metals, in

which are formed pockets filled with graphite B. An annular groove is formed at each end and is filled with graphite, as at B. This affords bearings for the contactsprings of the trolley fork or harp.

In use the receptacle A" is filled'with oil, and it escapes very gradually through the perforation e, and a very small quantity of oil is thus distributed over the bearing-surface, which is all that is necessary to produce perfect lubrication when the bushing is provided withthe sections of graphite.

We desire to state that the particular arran gement and manner in which the graphite is placed in the bushing is not material to our invention as long as thereis a bushing-adapted to receive and hold the graphitein such a position that it will form part of the bearing-surface and that this in connection with the means of delivering a very small quantity of oil is all that is necessary to produce the successful trolley wheel. The centrifugal force carries the Oil to the periphery of the oil-receptacle when the wheel is in motion, so that the Oil is delivered to the bearings only when the wheel is at rest, thus preventing a Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is V A trolley-wheel with a suitable hub containing a receptacle therein and bushing inserted tightly into said hub forming asealed hands and seals in the presence of two witchamber which bushing contains receptacles nesses. supporting graphite in position to form part FRED P. OROOKETT. [L. 8.] 0f the bearing-surface; the said bushlng conv w 1 tainingasingle perforation to deliver oil from PRENTISS JOHNbON' the oil-receptacle thereto, coacting for the Witnesses: purpose specified. LELA M. BROWN,

In witness whereof we have hereunto set our OTIS A. EARL. 

